blank webtop on citrix_xendesktop iapp

hi, everyone

i have a somewhat annoying problem that occurs every now and then, mostly after a reboot of the bigip's. i have published a solution using the citrix_xenapp_xendesktop_2012_06_27, which works fine for most of the time. But there has been a few occasions now, mostly after a reboot, that users log in, an only find a blank wetop waiting for them, with no applications to choose from.

The easy workaround is to simply reapply the access policy, but i would like to see if there is a more permanent solution to this. im running a HA pair of 4200's on version 11.5.2, with ltm+asm+apm modules liscensed.